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mean proportional

American

noun

Mathematics.

(between two numbers a andb ) a number x for which a/x = x/b .

The number 3 is a mean proportional between 1 and 9.

Etymology

Origin of mean proportional

First recorded in 1565–75

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

One of the isothermal surfaces will be a sphere S surrounding the sink, which, however, will not be at the centre of the sphere, but so situated that the source, sink, and centre are in line, and that the radius of the sphere is a mean proportional between the distances of the source and sink from the centre.

From Project Gutenberg

Define ratio, proportion, mean proportional, third proportional, fourth proportional.

From Project Gutenberg

Find a mean proportional between 4 and 16; 18 and 50; and 3.

From Project Gutenberg

The second of three numbers is a mean proportional between the other two.

From Project Gutenberg

If 4 quantities are in proportion and the second is a mean proportional between the third and fourth, prove that the third will be a mean prop. between the first and second.

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023